JP3729358B2 - Hydraulic shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a hydraulic shock absorber that is mounted on a vehicle such as a four-wheeled vehicle, a motorcycle, or a special bicycle and absorbs vibrations input to the traveling vehicle.
[0002]
[Prior art and its problems]
There have been various proposals for hydraulic shock absorbers that are mounted on vehicles such as automobiles, motorcycles, and special bicycles to absorb vibrations input during traveling, but most of them are resistant to spring force. Thus, when the piston rod immersed in the cylinder is projected from the inside of the cylinder by a spring force, a so-called compression-side structure is formed in which a predetermined amount of damping force is generated.
[0003]
On the other hand, when the piston rod that protrudes from the cylinder so as to resist the spring force is immersed in the cylinder by the spring force, a so-called pulling-out structure is formed in which a predetermined amount of damping force is generated. There are not a few proposals for the hydraulic shock absorbers.
[0004]
According to this pulling-out hydraulic shock absorber, for example, a link mechanism is adopted for a suspension structure of a rear wheel in a motorcycle, and a hydraulic shock absorber for the rear wheel, that is, a shock absorber is used as a so-called single shock. In this case, it is said that it is advantageous in terms of space on the installation.
[0005]
For this reason, for example, a pulling-type hydraulic shock absorber according to Japanese Utility Model Laid-open No. 60-7340 or Japanese Patent Publication No. 62-48103 has been proposed. A defect is pointed out.
[0006]
First, in any of the hydraulic shock absorbers according to any of the above proposals, the so-called damper is set to be in the most compressed state when no external force is applied, and the damper has a spring force. In order to generate a damping force having a predetermined magnitude when the compression operation is performed, a configuration having so-called gas chambers separated from each other is set.
[0007]
Therefore, in the damper, since the gas pressure in the gas chamber becomes the highest state at the time of the maximum compression, if the gas is supplied to the gas chamber when the damper is in the maximum compression state by the spring force, There is a problem that requires high gas pressure.
[0008]
Next, the hydraulic shock absorber according to any of the above proposals has a bump member that exhibits a cushioning effect. However, in the proposal according to Japanese Utility Model Laid-Open No. 60-7340, an external force is applied. Since the bump member is always in pressure contact with the opposite part at the time of the most compression that does not act, there is a problem that so-called deterioration is accelerated and durability cannot be expected.
[0009]
On the other hand, in the proposal according to Japanese Examined Patent Publication No. 62-48103, the bump member is configured to be pressed into contact with the other part only when an external force is applied. Since the bump member is arranged in the cylinder constituting the damper, the effective area of the bump member tends to be set small, so that a predetermined cushion effect cannot be obtained and durability can be expected. There is a bug that disappears.
[0010]
Further, in any of the hydraulic shock absorbers according to any of the above proposals, the mounting portions on the vehicle body side or the axle side of the vehicle are distributed at both ends of the hydraulic shock absorber. There is a problem that the length between the mounting portion on the side, that is, the mounting length cannot be shorter than the entire length of the hydraulic shock absorber in the state where the mounting length is compressed to the maximum.
[0011]
As a result, for example, as described above, when a link mechanism is used for the suspension structure of the rear wheel in the motorcycle, and when the hydraulic shock absorber for the rear wheel, that is, the shock absorber is a so-called single shock, It cannot be necessarily said that it will be advantageous in terms of installation space.
[0012]
In addition, in any of the above-described hydraulic shock absorbers, it is possible to adjust the vehicle height by changing the spring initial in the hydraulic shock absorber mounted on the actual vehicle, or to change the initial spring. In addition, there is a problem that it is impossible to realize adjustment of the vehicle height while maintaining a constant damping ratio by replacing the damper with one having a different damping characteristic.
[0013]
The present invention has been developed in view of the above-described circumstances, and the object thereof is easy to manufacture and excellent in durability, and is a length between the first mounting portion and the second mounting portion. It is an object of the present invention to provide a hydraulic shock absorber that is optimal for mounting on a vehicle such as a four-wheeled vehicle, a motorcycle, or a special bicycle, which is advantageous for mounting on a vehicle or the like by shortening the length.
[0014]
[Means for Solving the Problems]
In order to achieve the above-described object, the structure of the present invention includes a damper that is always urged in a direction of extension by a compression spring, a first mounting portion provided at an end of a cylinder body of the damper, and a piston rod of the damper. A connecting member that extends in the direction opposite to the piston rod body along the outer periphery of the damper while being coupled to the end of the body, and a second attachment provided at the end of the connecting member adjacent to the first attaching portion In the hydraulic shock absorber comprising a part, the connecting member is constituted by a cylindrical body having one end connected to the end of the piston rod body and the other end extending to the end of the cylinder body. A mounting bracket for forming the second mounting portion is provided continuously at the end of the cylindrical body, and a long hole for exposing the first mounting portion to the cylindrical body is formed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the illustrated embodiments. As shown in FIG. 1, a hydraulic shock absorber according to an embodiment of the present invention includes a damper D that is constantly urged by a compression spring S in an extending direction, and a first end provided on an end of a cylinder body 1 of the damper D. An attachment portion A for attaching an axle as an attachment portion of 1 and a connecting member 10 extending in the opposite direction to the piston rod body 2 along the outer periphery of the damper D while being coupled to the end of the piston rod body 2 of the damper D; The connecting member 10 includes an attachment portion B for mounting a vehicle body as a second attachment portion provided in the vicinity of the first attachment portion at an end portion of the connection member 10, and the connection member 10 has a piston rod at one end. The cylindrical body 11 is connected to the end of the body 2 and the other end extends toward the end of the cylinder body 1, and a second mounting portion is formed at the end of the cylindrical body 11. The mounting bracket 12 to be connected is connected, and the first mounting portion is attached to the cylindrical body 11. Those forming the long hole 15 to exhibit.
And when the space | interval of the 1st attachment part A of the hydraulic shock absorber and the 2nd attachment part B becomes large, the damper D will compress and generate | occur | produce a damping force, and the said 1st, 2nd attachment part A, When the interval B becomes small, the damper D extends to generate a damping force.
[0016]
More specifically, the damper D of the hydraulic shock absorber shown in FIG. 1 applies the piston rod body 2 immersed in the cylinder body 1 against the spring force of the spring S composed of a compression spring to the spring force of the spring S. Is set to generate a predetermined damping force when protruding from the cylinder 1 body.
[0017]
On the other hand, the hydraulic shock absorber sets the right end in the drawing of the cylinder body 1 in the damper D to the attachment portion A on one end side, while the left end in the drawing of the piston rod body 2 in the damper D. The other end of the connecting structure 10 whose one end is connected to the base end is set to the attachment portion B on the other end side positioned so as to be adjacent to the attachment portion A on the one end side.
[0018]
In other words, the linkage structure 10 includes a damper D interposed with a spring S made of a compression spring so as to be slidable in the presence of the bush 4, and one end that is the left end in the figure is the base end of the piston rod body 2. A cylindrical body 11 is provided which is provided continuously and has the other end, which is the right end in the figure, extending to the base end side of the cylinder body 1.
[0019]
The connecting structure 10 is provided with a mounting bracket 12 that forms the mounting portion B on the other end side connected to the other end of the cylindrical body 11, and a base of the cylinder body 1 on the inner peripheral side of the cylindrical body 11. The mounting portion A on the one end side that is the end is present.
[0020]
The mounting bracket 12 is fitted with a mounting collar 13 that allows a connected member (not shown) to pass therethrough, and the mounting collar 14 is also fitted to the mounting portion A on the one end side. .
[0021]
Further, the connecting structure 10 has a so-called pair of left and right elongated holes 15, 15 that are opened in the cylindrical body 11 in the operation direction of the damper D and expose the attachment portion A on one end side. The mounting portion A on the one end side is exposed in the hole 15, that is, in the illustrated embodiment, both ends of the mounting collar 14 are present.
[0022]
Incidentally, the spring S has one end which is the left end in the figure locked to one end side of the cylindrical body 11 under the arrangement of the spring receiver 5, and the other end connected to the cylinder body 1. It is latched by the spring receiver 6 which makes the exterior.
[0023]
The spring receiver 6 is connected to the outer periphery of a bracket member 7 that holds the base end side of the cylinder body 1 in a fixed manner in the illustrated embodiment. The bracket portion 7a is formed on the base end which is the right end, and the mounting portion A on the one end side is configured to fit the mounting collar 14 thereon.
[0024]
Therefore, in the hydraulic shock absorber according to this embodiment formed as described above, for example, the axle attachment portion A that is the first attachment portion is connected to the axle side (not shown) of the vehicle. Thus, the mounting portion B for mounting the vehicle body, which is the second mounting portion, is connected to the vehicle body side (not shown) in the vehicle, and the vibration from the road surface on which the vehicle travels is absorbed by the expansion and contraction. That is, when the distance between the first and second mounting portions A and B is increased by vibration from the road surface, the damper D is compressed to generate a damping force, and the distance between the mounting portions A and B is decreased. The damper D extends to generate a damping force.
[0025]
In this case, in the hydraulic shock absorber, the attachment portion A on one end side and the attachment portion B on the other end side are disposed so as to be concentrated on one end side of the hydraulic shock absorber. , The length between the attachment portion A on the one end side and the attachment portion B on the other end side, that is, the attachment length becomes shorter than the entire length of the hydraulic shock absorber in the most compressed state. It is advantageous in terms of space when mounting the hydraulic shock absorber to the vehicle.
[0026]
That is, in the hydraulic shock absorber as the conventional example described above, the mounting portions on the vehicle body side and the axle side are distributed and arranged at both ends in the expansion / contraction direction of the hydraulic shock absorber. In such a hydraulic shock absorber, since it is provided to be concentrated on one end side, the mounting length described above is shortened and the mounting property to the vehicle is excellent.
[0027]
In the hydraulic shock absorber, since the spring S is a compression spring and the damper D is set for compression, the damper D is in the most extended state when no external force is applied. Therefore, although not shown, when the damper D is set to have a structure having separated gas chambers, a very high gas pressure is not required for supplying gas to the gas chamber.
[0028]
Further, the bump member 3 in the damper D is pressed against the other part, that is, the cylinder body 1 when the damper D is compressed to the maximum by the action of an external force against the spring force of the spring S so as to exert a cushioning effect. In addition, since the piston rod body 2 outside the cylinder body 1 can be set to be disposed on the base end side on the left side in the drawing, the bump member 3 is always pressed against the other part. Compared to the case of the above, there is no fear of deterioration, and the diameter of the bump member 3 is set large to increase the effective area, so that a predetermined cushion effect can be surely obtained.
[0029]
FIG. 2 shows a hydraulic shock absorber according to a reference example of the present invention. In this reference example, it is assumed that the suspension structure and the connection structure 10 of the spring S are mainly changed. The damper D, which is another configuration, and the configuration related thereto are basically not different from the above-described embodiment.
[0030]
Therefore, the place is the same as the embodiment the configuration is described above is to only denoted by the same reference numerals in the figure, and explanation thereof is omitted except when required, the following, characterized in this reference example The explanation will be centered on the point.
[0031]
That is, in the hydraulic shock absorber according to this embodiment, the connecting structure 10 includes a bracket 16 connected to the base end which is the right end in the drawing of the piston rod body 2, and one end of the bracket 16 whose position is changed. A pair of connecting rods 17 and 17 that are connected to each other and extend to the base end side, which is the left end side of the cylinder body 1 in the drawing, and to each other end of the pair of connecting rods 17 and 17. And a mounting bracket 12 that forms a mounting portion B on the other end side. The mounting bracket 12 forms a mounting portion B on the other end side of the hydraulic shock absorber.
[0032]
Of course, the mounting portion B on the other end side is positioned so as to be adjacent to the mounting portion A on the one end side which is the base end of the cylinder body 1.
[0033]
Incidentally, the connecting structure between the bracket 16 and the connecting rod 17 is in the illustrated embodiment, and the threaded portion 17a of the connecting rod 17 is inserted through the through hole 16a of the bracket 16, while the connecting rod 17 This is based on a double nut structure in which nuts 18 and 18 that are screwed so as to sandwich the bracket 16 from both directions are fastened and fixed from both directions.
[0034]
Further, the connection structure between the mounting bracket 12 and the connecting rod 17 is in the illustrated embodiment, and although not shown, the other end of the connecting rod 17 is screwed to the mounting bracket 12 and the screwed state is changed to a nut. This is based on a lock nut structure in which the 18 is secured.
[0035]
On the other hand, the connecting structure 10 is capable of moving the guide member 8 connected to the mounting portion A on one end side which is the base end of the cylinder body 1 to the pair of connecting rods 17, 17, that is, the guide member 8. The connecting rod 17 is connected in a state where the connecting rod 17 is inserted into the through hole 8a opened at both ends.
[0036]
The guide member 8 is formed by connecting a bracket portion 7a formed at the base end of the bracket member 7 that holds the base end side of the cylinder body 1 fixedly to the attachment portion A on the one end side, that is, the cylinder body 1. Yes.
[0037]
Incidentally, the bracket member 7 may be set so as to hold the base end side of the cylinder body 1 so as to be separable. In this case, as will be described later, the connection of the bracket 16 is possible. The damper D can be separated from the bracket member 7 by separation from the rod 17.
[0038]
By the way, in the illustrated reference example , the spring receiver 6 that locks the other end, which is the left end in the drawing, of the spring S that is an compression spring interposed in the damper D is a screw formed on the outer periphery of the cylinder body 1. For example, it is set so that it can move in the axial direction of the cylinder body 1, that is, in the expansion / contraction direction of the damper D, when rotating by manual operation.
[0039]
Therefore, the hydraulic shock absorber according to the reference example formed as described above connects the attachment portion A on one end side to, for example, the axle side (not shown) in the vehicle, while attaching on the other end side. The initial of the spring S can be changed by moving the spring receiver 6 in the expansion / contraction direction of the damper D on the outer periphery of the cylinder body 1 with the portion B being connected to the vehicle body side (not shown) of the vehicle. Therefore, the spring force can be changed according to the magnitude of the burden load on the hydraulic shock absorber.
[0040]
Further, in this reference example , on the condition that the threaded portion 17a of the connecting rod 17 is set to be long to some extent, the connecting position of the bracket 16 and the connecting rod 17 is set in the axial direction of the connecting rod 17 with the mounting state maintained. As a result of the change in the connecting position, the support position of the spring S locked to the bracket 16 under the presence of the spring receiver 5 can be changed in the expansion / contraction direction of the damper D.
[0041]
As a result, in this reference example , in the hydraulic shock absorber, the initial of the spring S can be changed, and at this time, the expansion / contraction stroke in the damper D can be changed in accordance with the change of the initial of the spring S. become.
[0042]
When the cylinder body 1 is detachably held by the bracket member 7, as described above, the damper D is detached from the connecting rod 17 and the damper D is attached to the bracket member with the mounting state maintained. 7, for example, the damper D can be replaced with one having a different damping characteristic, and at this time, the spring S can be replaced with another spring S having a different spring constant. Become.
[0043]
In the reference example shown in FIG. 2 as well, the gas supplied to the gas chamber of the damper D is advantageous in terms of space when mounted on the vehicle, as in the embodiment shown in FIG. Needless to say, the pressure does not need to be extremely high, and an effective cushioning effect can be expected for the bump member 3.
[0044]
【The invention's effect】
As described above, in the first aspect of the invention, since the first and second attachment portions are provided concentrated on one end side of the hydraulic shock absorber, the attachment portion is provided in the expansion / contraction direction of the hydraulic shock absorber. Compared to the case where the hydraulic shock absorbers are distributed at both ends, the mounting length is shorter than the entire length of the hydraulic shock absorber, and therefore, it is advantageous in terms of space when mounting the hydraulic shock absorber to the vehicle. It will be excellent in mountability.
[0045]
Further, in the present invention, since the damper is set in a compression manner, it is in the most extended state when no external force is applied, and therefore the damper has a gas chamber that is separated. When the gas chamber is set to, a very high gas pressure is not required for supplying the gas to the gas chamber.
[0046]
In the embodiment of the present invention, the bump member is pressed against the other part when the damper is fully compressed by the external force action against the spring force of the compression spring, and exhibits a cushioning effect. In addition, since the bump member is disposed outside the cylinder body, there is no fear of deterioration as compared with the case where the bump member is always pressed against the other part, and the bump member has a large diameter. The effective area is increased, and a predetermined cushion effect can be reliably obtained.
[0047]
Furthermore, according to the present invention, it is easy to manufacture, has excellent durability, is advantageous in mounting on a vehicle, and can adjust the vehicle height, and can be mounted on a vehicle such as a four-wheeled vehicle, a motorcycle, or a special bicycle. There are advantages to be optimal.
[0048]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a part of an hydraulic shock absorber according to an embodiment of the present invention in an elevational view.
FIG. 2 is a longitudinal sectional view showing a hydraulic shock absorber according to a reference example , similar to FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder body which constitutes damper 2 Piston rod body which constitutes damper 4 Bush 6 Spring receiver 8 Guide member 10 Connecting structure 11 Cylindrical body 12 Mounting bracket 15 Long hole 16 Bracket 17 Connecting rod A Axle mounting as first mounting portion Mounting portion B for mounting the vehicle body as the second mounting portion D damper S spring

Claims (1)

Along the outer periphery of the damper while being coupled to an end of the cylinder body of the damper, a damper attached to the end of the cylinder body of the damper, and a damper that is always urged in the extension direction by a compression spring In the hydraulic shock absorber comprising a linking member extending in the opposite direction to the piston rod body and a second mounting portion provided adjacent to the first mounting portion at an end of the linking member, the linking member has one end An attachment that is connected to the end of the piston rod body and that the other end is formed of a cylindrical body that extends toward the end of the cylinder body, and that a second attachment portion is formed at the end of the cylindrical body. with Ru is continuously provided to the bracket, a hydraulic shock absorber, characterized in that the formation of the elongated hole for exposing the first attachment portion to the tubular body

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